Grinding machine



Oct. 19, 1943.

F. H. PEMBROKE GRINDING. MACHINE Filed $ept. 10, 1940 5 Sheets-Sheet l INVENTOR. Fez/e rick H. Pembroke ATTORNEY.

Oct. 19, 1943.

F. H. PEMBROKE GRINDING MACHINE Filed Sept. 10, 1940 5 Sheets-Sheet 2 INVEN'IITOR. En? Jew/6,4. m m/iie ATTORNEY.

Oct. 19, 1943. F. H. PEMBROKE 3 GRINDING MACHINE Filed Sept. 10, 1940 3 Sheets-$heet 3 28 z? v I UUUUUDUUUUUUDUHUU INVENTOR.

Kw dgwi k H. F embw e ATTORNEY.

Patented Oct. 19, 1943 i UNITED STATES PATENT OFFlC-Et, f

GRINDING MACHINE Frederick H. Pembroke, Brighton, N. Y.

Appiication September 1940, Serial No. 356,154

3 Claims.

quantity of paper'with a so-called dope. This dope is composed of oils, Waxes, and pigments or colors. These pigments or colors are furnished in varying degrees of fineness, and are first mixed with the oils and waxes in suitable proportions to the final composition. During this mixing operation some of the pigments or colors are apt to coalesce forming lumps, andthese lumps, whether they exist in the pigment or color before it is mixed in the dope, or whether they are formed during the mixing operation, must be reduced to a suitable fineness and must be uniformly mixed or permeated through the waxes and oils. Only then is the dope ready to be coated on the paper that is intended to receive it for the purpose of making the product known as carbon paper.

The invention which constitutes the subject matter of this application is to provide an improvement on a well known type of grinding mill which is used for grinding the dope, which well known type of grinding mill constitutes no part of my invention.

These grinding mill have rollers which are power driven and serve to crush the solid matter and mix it with the waxes and oils, or with the liquid matter such as is used in making printing inks and ribbon inks.

The rolls used in machines of this sort ary in diameter and length, The dope is placed between the first pair of rolls. Heretofore. various expedients have been used to prevent the dope from spreading along the first pair of rolls and flowing out from the ends of the rolls. My

invention is for the purpose of preventing the dope from leaking out from the ends of the rolls and comprises the use of certain discs that are pressed against the ends of apair of roll for the purpose of closing the ends of the crease or trough that exists between the rolls.

These and other objects of the invention will be illustrated in the drawings, described in the specification, and pointed out in the claims at the end thereof.

In the drawings:

Figure l is a top plan view of a roller or grinding mill of a standard type to which my invention is applied. 7

Figure 2 is a section on the line 212-21: of Figure l, the scale being somewhat enlarged.

Figure 3 is a detail view of a portion of the ends of the first and second rolls, together with the frame in which said rolls are mounted, together with the retaining disc which bears Carbon paper is made by coating 2. suitable against the ends of the v rolls, which disc" and its combination with the rolls constitutes'my improvement or invention.

Figure 4 is a top plan View of the mill with:

the driving mechanism exposed.

Figure 5 is an end View of rolls 1 and B with a stationary plate shown abutting thereon.

Figure 6 is an end view of rolls 1 and 8 with a rotating disc shown abutting thereon.

In the drawings like reference numerals indi-i Each of the side frames l, l encloses along, rectangular open space, which may be called a box. In each box is mounted blocks 2, 3 and d, which blocks carry the bearings in which the shafts of the rolls rotate. These blocksare'normally held apart by springs placed between the blocks, so that the rolls are held out of contact with eachiother. The blocks that support the middle roll'may be held stationary in any suit- The blocks that support the end" able manner. rolls are forced toward the blocks which support the middle roll by an adjusting screw 5 at one end and 8 at the other end. These screws are. adjusted so that rolls 7' and t are spaced apart a few thousandths of an inch, and rolls 8 and 9.

are spaced apart a less amount.

Mounted to rotate between the frames I is a shaft it, on the ends of which are keyed or are preferably splined retaining discs I! and i2. Sur-- rounding the shaft is between the bearings, I 3 and M thereof and the retaining discs are the compression springs and i t, which bear against the discs and press them against the ends of the roll 7 and i3 and close the end of the trough between the roll at each-end.

As shown in Figure 2, the r0115 1 and 9 rotate in a clockwise direction and roll 8 rotates counterclockwise. It will also be understood that roll 8 rotates with an angular velocity somewhat greater than roller 1, and roll 9 rotates at a somewhat greater angular velocity than roll 8,

contact with the roll 9. The fact that the rolls rotate progressively faster gives not only a crushing action but a grinding action as well. It will also be understood that the mixing takes place wherever the dope comes in contact with the rolls, and that the crushing and grinding occurs between the rolls.

As the rolls rotate, the dope tends to spread toward the ends of the rolls and must be mechanically restrained from flowing over the ends of the rolls. This result is secured by the use of the discs H and 12, which constitute the subject matter of my invention, and because the discs are placed at the ends of the rolls the full length of the rolls are more available for the purpose of crushing, and grinding, and mixing the dope than is possible with devices heretofore used that are applied to the rolls at some distance from the ends thereof.

The shaft on which these rolls are splined, rather than keyed, is rotated in the direction of the arrow shown in Figure 2, so that the discs wear uniformly and so that they will contact with any dope that leaks through at the ends of the rolls, and will carry the dope up and scrape it off on the roll 8, thus conserving the dope and preventing the waste thereof.

A large mass of the dope is carried between the rolls 1 and 8, while between the other suceeding rolls only a thin film of the dope is carried; therefore, the retaining discs are not as necessary between rolls 8 and 9 as they are between rolls 1 and 8.

On the. shaft which carries the discs H and. I! are also provided beaters, which assist in mixing the dope and keeping it stirred up.

The dope that is carried by the roll 9 is stripped off of it by the roll [8, which presses firmly against it and is rotated with a peripheral velocity considerably greater than the peripheral velocity of the roll 9. The dope is scraped off of the roll I8 by means of the concave shoe I9, which feeds it into the trough 20, from which it is removed to be used in the coating machine.

It will be understood that the roll I8 is held to. bear firmly against the roll 9, and the shoe l9 and the trough 29 move together, so that the shoe I9 is held to bear against the roll 13. This is for the purpose of securing a clean stripping of the dope or materialfrom the roll 9 and the feeding of it into the trough 20.

The apparatus is driven by a motor 25, chain 26, and sprocket wheel 21, which in turn drives a shaft 28, which in turn drives a gear 29 on the opposite side of the machine. This gear meshes with gear 30 which is on shaft 3| on the roll 9.

turn drives the large gear 36 carried on the shaft 31, which in turn drives the roll 1. On the shaft 31 'is a small sprocket wheel 38, which drives a smaller sprocket wheel 39 by means of the chain 40. The sprocket 39 drives the shaft It) on which the discs II and I2 are mountedf On the shaft 3| is carried a sprocket wheel 42 which drives a chain 43, which in turn drives a sprocket wheel 44, which drives the shaft 45 on which the roll I8 is carried.

In Figure 6 I have shown an ordinary caster wheel 50 mounted in the frame in any suitable manner, so that it bears against the disc H and holds the discs firmly against the ends of the rolls.

In Figure 5 I have shown the stationary plate 5| supported from the frame in any suitable manner, which plate normally bears against the ends of the rolls and is also held against the ends of the rolls by caster wheel 50, which is also supported from the frame in any suitable manner.

I claim: 7

'1. In a grinding machine, the combination of a pair of grinding rolls adapted to grind pigment or color, plates mounted to press against the ends of said grinding rolls, said plates being adapted to close the open space above the rolls at both ends of the rolls, a shaft on which said plates are carried'said shaft extending across above the rolls and means carried on said shaft for yieldingly pressing said plates against the ends of the rolls.

2. In a grinding'machine, the combination of a pair of grinding rolls adapted to grind pigment or color, plates mounted to press against the ends of said grinding rollsfsaid plates being adapted to close the open space above the rolls at both ends of the rolls, a shaft on which said plates are carried said shaft' extending across above the rolls and means carried on said shaft for yieldingly pressing said plates against the ends of the rolls, means to rotate said plates in contact with the rolls.

3. Ina grinding machine, the combination of a pair of grinding rolls adapted to grind pigment or color, plates mounted to press against the ends of said grinding rolls, said plates being adapted to close the. open space above the rolls at both ends of the rolls, a shaft on which said plates are carried said shaft extending across above the rolls and means carried on said shaft for yieldingly pressing said plates against the ends of the rolls, said plates being adapted to rotate in contact with the rolls, means for rotating the shaft, fingers on said shaft for stirring up the dope carried on the rolls.

FREDERICK H. PEMBROKE. 

